144. Binary Tree Preorder Traversal 提交网址:https://leetcode.com/problems/binary-tree-preorder-traversal/ Total Accepted:118355Total Submissions:297596Difficulty:Medium Given a binary tree, return thepreordertraversal of its nodes' values. For example: Given binary tree{1,#,2,3}, 1 \ 2 / ...
方法一:使用迭代(C++) 1vector<int> preorderTraversal(TreeNode*root) {2vector<int> res={};3if(!root)4returnres;5stack<TreeNode*>s;6TreeNode* cur=root;7while(!s.empty()||cur){8while(cur){9res.push_back(cur->val);10s.push(cur);11cur=cur->left;12}13cur=s.top();14s.pop()...
LeetCode 144. Binary Tree Preorder Traversal Solution1:递归版 二叉树的前序遍历递归版是很简单的,前序遍历的迭代版相对是最容易理解的。 迭代版链接:https://blog.csdn.net/allenlzcoder/article/details/79837841 Solution2:迭代版 前序遍历也是最简单的一种,分为下面三个步骤: 1...Leet...
Binary Tree Preorder Traversal -- LeetCode 原题链接: http://oj.leetcode.com/problems/binary-tree-preorder-traversal/ 跟Binary Tree Inorder Tr...144 Binary Tree Preorder Traversal 1 题目 2 尝试解 3 标准解 ...Binary Tree Preorder/Postorder Traversal 树的前序和后序遍历是树相关算法的...
LeeCode:144. Binary Tree Preorder Traversal 题目描述 Given a binary tree, return the preorder traversal of its nodes’ values. Example: Input: [1,null,2,3] 1 \ 2 / 3 Output: [1,2,3] 1. 2. 3. 4. 5. 6. 7. 8. Follow up:Recursive solution is trivial, could you do it iter...
At each node in this traversal, we outputDdashes (whereDis the depth of this node), then we output the value of this node. If the depth of a node isD, the depth of its immediate child isD + 1. The depth of therootnode is0. ...
Given a binary tree, return thepreordertraversal of its nodes' values. For example: Given binary tree{1,#,2,3}, 1 \ 2 / 3 1. 2. 3. 4. 5. return[1,2,3]. 解法一: 递归方法: 如果root不为空, 先访问根,递归左子树,递归右子树。
题目: Given preorder and inorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the tree. 根据前序遍历和中序遍历结果构造二叉树。 思路分析: 分析二叉树前序遍历和中序遍历的结果我们发现: 二叉树前序遍历的第一个节点是根节点。 在中序遍历...
971. Flip Binary Tree To Match Preorder Traversal # 题目 # You are given the root of a binary tree with n nodes, where each node is uniquely assigned a value from 1 to n. You are also given a sequence of n values voyage, which is the desired pre-order
或leetcode 105:https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/ 参与人数:5246 时间限制:1秒 空间限制:32768K 题目描述 输入某二叉树的前序遍历和中序遍历的结果,请重建出该二叉树。假设输入的前序遍历和中序遍历的结果中都不含重复的数字。例如输入前序遍历序列{1,...